Ernst, Max
MLA
Dreier, Katherine S. (Katherine Sophie), 1877-1952. Ernst, Max. Box 102, folder 2507-2508. 1926-48, n.d.. https://collections.library.yale.edu/catalog/2012168.
APA, 6th edition
Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 102, folder 2507-2508"])(1926-48, n.d.)[Ernst, Max]. https://collections.library.yale.edu/catalog/2012168.